it.unibz.inf.ontop.iq.node

Interface EmptyNode

All Superinterfaces:

Cloneable, ExplicitVariableProjectionNode, IQTree, LeafIQTree, QueryNode

All Known Implementing Classes:

EmptyNodeImpl

public interface EmptyNode
extends LeafIQTree

Temporary QueryNode that says that replace a non-satisfied sub-tree. Is expected to remove quickly. See IntermediateQueryFactory for creating a new instance.

Method Summary

Modifier and Type	Method and Description
EmptyNode	acceptNodeTransformer(HomogeneousQueryNodeTransformer transformer) "Accept" method for the "Visitor" pattern.
EmptyNode	clone() Cloning is needed for having multiple copies in the same intermediate query tree.

Methods inherited from interface it.unibz.inf.ontop.iq.LeafIQTree

getRootNode

Methods inherited from interface it.unibz.inf.ontop.iq.IQTree

acceptTransformer, acceptVisitor, applyDescendingSubstitution, applyDescendingSubstitutionWithoutOptimizing, applyFreshRenaming, applyFreshRenamingToAllVariables, getChildren, getKnownVariables, getNotInternallyRequiredVariables, getPossibleVariableDefinitions, getVariableNullability, getVariables, inferUniqueConstraints, isConstructed, isDeclaredAsEmpty, isDistinct, isEquivalentTo, isLeaf, liftIncompatibleDefinitions, normalizeForOptimization, propagateDownConstraint, removeDistincts, replaceSubTree, validate

Methods inherited from interface it.unibz.inf.ontop.iq.node.ExplicitVariableProjectionNode

getVariables

Methods inherited from interface it.unibz.inf.ontop.iq.node.QueryNode

acceptVisitor, getLocallyDefinedVariables, getLocallyRequiredVariables, getLocalVariables, getRequiredVariables, isEquivalentTo, isSyntacticallyEquivalentTo, isVariableNullable

Method Detail

clone

EmptyNode clone()

Description copied from interface: QueryNode

Cloning is needed for having multiple copies in the same intermediate query tree.

Specified by:

clone in interface QueryNode

acceptNodeTransformer

EmptyNode acceptNodeTransformer(HomogeneousQueryNodeTransformer transformer)
                         throws QueryNodeTransformationException

Description copied from interface: QueryNode

"Accept" method for the "Visitor" pattern. To be implemented by leaf classes. If the transformation cannot be done, throw a QueryNodeTransformationException

Specified by:

acceptNodeTransformer in interface LeafIQTree

Specified by:

acceptNodeTransformer in interface QueryNode

Throws:

QueryNodeTransformationException